Well, I would agree with many points of this discussion for sure.
We’re still preparing some marketing materials on the FR-30 but I can share that the low frequency cutoff is -6 db at 27 Hz. With a reflex/passive radiator enclosure, the roll-off below this is rather steep but you’ll see typically see extension from 20-25 Hz in-room. Still, as other mention, the benefit of multiple subs/ LF sources will help smooth the response wider listening area.
Please keep in mind that, if you listen to dynamic music in the bass and want a subwoofer that “keeps up” with the speaker, you’ll need something pretty potent. A pair of FR-30, with their 8 x 8" woofers and 8 x 10" passive radiators is capable of ~120 dB (in half space) from 25 hz and up with (when driven with 600 watts x 2) at the klippel rated Xmax of the woofers. Of course, you won’t want to listen full range at that level, but the system is certainly capable of it in the low frequencies, so that it has very low distortion at more moderate levels and a feeling of effortless bass dynamics.